Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1995-03-09
1997-06-10
Stephan, Steven L.
Electrical generator or motor structure
Dynamoelectric
Rotary
310328, 310254, H02K 710, H02K 112, H01L 4104
Patent
active
056379374
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a super-minuature motor used as a driving motor in super-precision minuature machines and the like and, particularly, to a super-miniature pulse motor which is miniaturized by excluding exciting coils.
2. Background Art
Conventionally, driving motors for super-precision miniature machines, for example, miniature motors used as driving motors of quartz crystal watches, are constructed, in the same manner as in large motors, from exciting coils consisting of copper wires wound around a part of a stators such that the motor is rotated by a driving force created by charging an exiting current to the exciting coils.
Thus, exciting coils are required for conventional miniature motors to generate a driving force. In the case where the exciting coils are used, a considerable number of windings is required for the coils. If the diameter of the wires for the coils is reduced to as small as 10 .mu.m or less for the purpose of miniaturization of the motors, the coils tend to be easily broken, making it extremely difficult to wind the coils around the starter.
Accordingly, the exciting coils must be inevitably thick and large, and it is very difficult to miniaturize motors as a whole.
An object of the present invention is therefore to provide a super-miniature motor which is miniaturized by excluding exciting coils, which prevents motors from being miniaturized.
DISCLOSURE OF THE INVENTION
The super-miniature motor of the present invention is constructed from a rotating member made from a permanent magnet, actuators which can be moved or displaced by a charged energy, and stators made from a magnetic material which are surrounding the outer periphery or both the upper and bottom surfaces of the rotating member, and movable along with the movement of the actuators in the radial direction of the motor.
A plural number of actuators are successively charged with a voltage as an energy source for changing distances between the corresponding stators and the rotating member to change a magnetic suction force. This change in the magnetic suction force causes the rotating member to rotate either clock-wise or counter clock-wise direction of the rotation axis thereof.
In the super-miniature motor of the present invention in which the driving force is acquired by changing gaps between the rotating member and the stators by the actuators which can be moved or displaced by a charged energy, there are no need for a larger-sized exciting coil for charging an exiting current. Thus, a super-miniature motor which is even smaller than existing small-sized motors can be provided by the present invention.
BRIEF DESCRIPTION OF THE DRAWINGS
FIGS. 1-6 are drawings of the super-miniature motors of the present invention, in which FIG. 1 is a plan view of the super-miniature motor of the first embodiment while the motor is at rest; FIG. 2 is a plan view of the super-miniature motor of the first embodiment while the motor is rotated by one step; FIG. 3 is a sectional view of the super-miniature motor of the second embodiment taken along line 3--3 in FIG. 4, while the motor is at rest; FIG. 4 is a plan view of the super-miniature motor of the second embodiment sectioned along line 4--4 in FIG. 3, while the motor is at rest; FIG. 5 is a sectional view of the super-miniature motor of the second embodiment taken along line 5--5 in FIG. 6, while the motor is rotated by one step; and FIG. 6 is a plan view of the super-miniature motor of the second embodiment sectioned along line 6--6 in FIG. 5, while the motor is rotating.
BEST MODE FOR CARRYING OUT THE INVENTION
The embodiments of present invention is hereinafter described referring to the drawings. The present invention shall not be construed as being limited by these embodiments.
In FIGS. 1 and 2, there are shown plan views of the first embodiment of the super-miniature motor, in which FIG. 1 shows the state where the motor is at rest and FIG. 2 shows the state when the motor is rotated by one step.
As s
REFERENCES:
patent: 4453103 (1984-06-01), Vishnevsky et al.
patent: 5432644 (1995-07-01), Tajima et al.
Citizen Watch Co. Ltd.
Stephan Steven L.
Wallace, Jr. Michael
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